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Good screen shots.
The sync separator plate is not right. It should show clean sharp pulses. Check for leaky coupling caps in the sync and video circuits.
Check resistor values in the sync separator grid and plate and video amp plate. Anything within 20% is OK for now. Voltage measurements at sync separator plate, grid and tuner AGC would be useful.
Those tube sockets can be trouble. They break internally between the pin and PC contact. Check for voltage differences at the tube pin and the PC contact pin. Differences point to a socket bad pin.
When/if changing a tube socket on a PC board, break the socket apart and unsolder one pin at a time. Heat only the pin, not the board, and push it through. Trying to remove an old socket in one piece will usually damage the board.
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